134 HUMAN ANATOMY. 



TENDO PALPEBRAKUM (TENDO OCULI). Origin, nasal proc- 

 ess of superior maxilla; insertion., inner part of tarsal cartilage. 



CORRUGATOR SuFERCiLii. Origin, superciliary ridge; in- 

 sertion, into orbicularis about the middle of the orbital arch; 

 action, draws eyebrows inward and downward and wrinkles the 

 forehead; nerve, facial. 



TENSOR TARSI. Origin, from crest and orbital surface of 

 lachrymal gland ; insertion, into tarsal cartilages near the puncta 

 lachrymalia; action, draws the lachrymal canals inward and 

 against the globe of the eye; nerve, facial. 



ORBITAL REGION\ 



LEVATOR PALPEBRJE SUPERIORIS. Origin, from lesser wing 

 of the sphenoid, near the optic foramen ; insertion, superior bor- 

 der of tarsal cartilage ; action, elevates the upper eyelid ; nerve, 

 third cranial, or motor oculi. 



EECTUS SUPERIOR. Origin, sheath of the optic nerve and 

 upper margin of optic foramen; insertion, into upper surface 

 of sclerotic coat ; action, rotates the eyeball upward ; nerve, third 

 cranial. 



RECTUS INFERIOR. Origin, from lower and inferior part 

 of optic foramen (ligament of Zinn) ; insertion, into lower sur- 

 face of sclerotic; action, rotates the eyeball downward; nerve, 

 third cranial. 



RECTUS INTERNUS. Origin, same as rectus inferior; inser- 

 tion, into inner surface of sclerotic; action, rotates the eyeball 

 inward; nerve, third cranial. 



RECTUS EXTERNUS. Origin, by two heads lower from liga- 

 ment of Zinn and lower margin of sphenoidal fissure, upper from 

 outer margin of optic foramen; insertion, into outer surface of 

 sclerotic; nerve, abducens, or sixth cranial. Passing between 

 the two heads are the ophthalmic vein, the third, nasal branch 

 of fifth, and sixth nerves. 



SUPERIOR OBLIQUE. Origin, from inner margin of optic 

 foramen: its tendon passes through a pulley near the internal 

 angular process of the frontal bone; insertion, into sclerotic, 

 between external and superior recti, midway between entrance 

 of optic nerve and the cornea; action, rotates the eyeball on its 

 axis; nerve, fourth, or patheticus. 



INFERIOR OBLIQUE. Origin, orbital plate of superior 

 maxilla; insertion, near that of superior oblique, between ex- 

 ternal and superior recti; action, rotates the eyeball on its axis; 

 nerve, third cranial. 



